F10: Air Pressure Switch Fault - TurboChef 3240 Service Manual

4 0 T R O U B L E S H O OT I N G
Are all the contacts
on the high limit
thermostat closed?
Investigate the reason for
the high limit tripping. If
the thermostat is defective,
replace it (page A-14).
Is line voltage
applied (208-240
VAC) to the
BMSC (page 25)?
YES
Replace the
combustion
blower
(page A-14).
Replace the K3
relay (page A-8).

F10: Air Pressure Switch Fault

YES
NO YES
Is the air pressure
switch closed?
NO
Is the combustion
blower running?
YES
NO
Is the air tube
connected tightly?
YES
Replace the
air switch
NO
(page A-14).
Check the
wiring
(page 45).
Replace the I/O
control board
(page A-8).
Troubleshooting:
Is the output of the burner
transformer 24 VAC (page
28)?
YES
Is the wiring
correct
(page 45)?
NO
Replace the
air tube.
Is coil voltage
(24 VDC)
NO
applied to the
K3 relay (page
YES
22)?
Does the burner trans-
former have line voltage
NO
applied to input
(208-240 VAC)?
YES
Replace the burner
transformer
(page A-8).
Replace the
I/O control
board
YES
(page A-8).
Correct wiring
NO
(page 45).
Are the K3 relay
NO
contacts closed?
Check the
wiring (page 45).
NO
YES